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Find the minimum sample size required to estimate a population proportion or percentage. As a newly hired manager of a company that provides cell phone service, you want to determine the percentage of adults in your state who live in a household with cell phones and no land-line phones. How many adults must you survey? Assume that you want to be 90% confident that the sample percentage is within four percentage points of the true population percentage.

A. Assume that nothing is known about the percentage of adults who live in a household with cell phones and no landlines phones.

B. Assume that a recent survey suggests that about 8% of adults live in a household with cell phones and no land-line phones.

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Statistics and Probability, Statistics

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